Just when you think you know what's going on, there's a new twist. When explaining it to others, I say, "if you were a fan of Lost, then you'll like Ostium." It's a story that has you expecting it to go somewhere, and then shows you a completely new and unexected perspective. The style appeals to my own internal dialog way of telling a story.
This is as much about "what" is going on as it is "why." At least if you let it be.